[PATCH] staging : greybus : Documentation : firmware : Replace deprecated strncpy() with strscpy()

[PATCH] staging : greybus : Documentation : firmware : Replace deprecated strncpy() with strscpy()

[rujra]

To ensuring that the firmware_tag is properly null-terminated. When
copying firmware tag strings to prevent buffer overflows and ensure
data integrity.

The maximum size of tag is GB_FIRMWARE_U_TAG_MAX_SIZE = 10 bytes, and it
may or may not be NULL-terminated.
included in "greybus_firmware.h"

changes has been made at 3 positions:
1: update firmware tag
2: backend update firmware tag
3: backend update firmware tag with unipro

Signed-off-by: Rujra Bhatt <braker.noob.kernel@gmail.com>
---
 drivers/staging/greybus/Documentation/firmware/firmware.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/greybus/Documentation/firmware/firmware.c
b/drivers/staging/greybus/Documentation/firmware/firmware.c
index 765d69faa..f37904b91 100644
--- a/drivers/staging/greybus/Documentation/firmware/firmware.c
+++ b/drivers/staging/greybus/Documentation/firmware/firmware.c
@@ -63,7 +63,7 @@ static int update_intf_firmware(int fd)
        intf_load.major = 0;
        intf_load.minor = 0;

-       strncpy((char *)&intf_load.firmware_tag, firmware_tag,
+       strscpy((char *)&intf_load.firmware_tag, firmware_tag,
                GB_FIRMWARE_U_TAG_MAX_SIZE);

        ret = ioctl(fd, FW_MGMT_IOC_INTF_LOAD_AND_VALIDATE, &intf_load);
@@ -101,7 +101,7 @@ static int update_backend_firmware(int fd)
        /* Get Backend Firmware Version */
        printf("Getting Backend Firmware Version\n");

-       strncpy((char *)&backend_fw_info.firmware_tag, firmware_tag,
+       strscpy((char *)&backend_fw_info.firmware_tag, firmware_tag,
                GB_FIRMWARE_U_TAG_MAX_SIZE);

 retry_fw_version:
@@ -129,7 +129,7 @@ static int update_backend_firmware(int fd)
        /* Try Backend Firmware Update over Unipro */
        printf("Updating Backend Firmware\n");

-       strncpy((char *)&backend_update.firmware_tag, firmware_tag,
+       strscpy((char *)&backend_update.firmware_tag, firmware_tag,
                GB_FIRMWARE_U_TAG_MAX_SIZE);

 retry_fw_update:
--
2.43.0

Re: [PATCH] staging : greybus : Documentation : firmware : Replace deprecated strncpy() with strscpy()

[Dan Carpenter]

On Sat, May 17, 2025 at 09:11:30AM +0530, rujra wrote:
> To ensuring that the firmware_tag is properly null-terminated. When
> copying firmware tag strings to prevent buffer overflows and ensure
> data integrity.
> 
> The maximum size of tag is GB_FIRMWARE_U_TAG_MAX_SIZE = 10 bytes, and it
> may or may not be NULL-terminated.
> included in "greybus_firmware.h"
> 
> changes has been made at 3 positions:
> 1: update firmware tag
> 2: backend update firmware tag
> 3: backend update firmware tag with unipro
> 
> Signed-off-by: Rujra Bhatt <braker.noob.kernel@gmail.com>

From doesn't match Signed-off-by line.

The patch is corrupted and doesn't apply.  Read the two paragraphs of
Documentation/process/email-clients.rst.

This is a usespace program so I don't think it has a strscpy()
function.  How did you compile this?

regards,
dan carpenter

Re: [PATCH] staging : greybus : Documentation : firmware : Replace deprecated strncpy() with strscpy()

[Rujra Bhatt]

Hi Dan,



On Fri, May 23, 2025 at 1:49 PM Dan Carpenter <dan.carpenter@linaro.org> wrote:
>
> On Sat, May 17, 2025 at 09:11:30AM +0530, rujra wrote:
> > To ensuring that the firmware_tag is properly null-terminated. When
> > copying firmware tag strings to prevent buffer overflows and ensure
> > data integrity.
> >
> > The maximum size of tag is GB_FIRMWARE_U_TAG_MAX_SIZE = 10 bytes, and it
> > may or may not be NULL-terminated.
> > included in "greybus_firmware.h"
> >
> > changes has been made at 3 positions:
> > 1: update firmware tag
> > 2: backend update firmware tag
> > 3: backend update firmware tag with unipro
> >
> > Signed-off-by: Rujra Bhatt <braker.noob.kernel@gmail.com>
>
> From doesn't match Signed-off-by line.
>
> The patch is corrupted and doesn't apply.  Read the two paragraphs of
> Documentation/process/email-clients.rst.
>
> This is a usespace program so I don't think it has a strscpy()
> function.  How did you compile this?

I mistakenly submitted the patch with a mismatched From: and
Signed-off-by: line. I’ll correct the author information from now
onwards patches by following the guidance in
Documentation/process/email-clients.rst.

Also, regarding the use of strscpy():
You're absolutely correct. It's a kernel-space function and not
available in user space. That call shouldn’t have been there. I’ll
replace it with a suitable userspace alternative, such as strncpy(),
as earlier it was.

Also I am not able to compile it properly. Will learn it the proper
way, as I have tried to compile it via turning ON the kernel
menuconfig for greybus support and
--- [*]"Greybus Firmware Download Class driver" then compiled it using
make and installed it, Also have not tested via "gcc -o firmware
firmware.c".
If you have any suggestions on how to compile or test this more
effectively, I would really appreciate your guidance.

Thank you so much for the feedback and review. Also sorry for my
delayed response.

regards,
Rujra Bhatt